Multi-task chair with synchro-tilt features pneumatic seat-height adjustment, 360-degree swivel, dual action synchro-tilt, tilt tension and tilt lock. This ergonomic task seating design includes a fully padded 17-1/4" wide back and seat and 2-1/2" hooded dual-wheel casters. Seat size is 18-1/2" wide x 18-3/4" deep. Seat-to-floor height ranges from 18" to 22-1/4". Back size is 17-1/4" wide x 18-3/4" high from the seat. Height-adjustable arms are sold separately. Chair meets or exceeds applicableANSI/BIFMA and ISTA performance standards.